1877 (Mar 15) envelope to Prussia, Germany, with 1877 8c on 10c green tied by Buenos Aires cds, underpaid with crayon "30" and "T / 1-10" postage due hs, reverse with London and Veryiers transits, Crefeld arrival, fine. (Image)

1889-91, "Santiago Derqui" 2c, multiple die proof of six printed on thin paper affixed to card, two examples in mauve and brown. A very scarce duo. (Image)

1889-91, "Rivadavia" & "Sarmiento" 5c and 6c in two proofs printed in blue on thin paper, the former cut a bit into at right with a blurred impression, the latter showing a proof of the frame with four crossed lines originating from the angles and the halves of each side with the purpose of determining the centre in the design where to apply the image of the portrait before platemaking, both produced during the first process of engraving. A unique duo. (Image)

1889-91, Unissued 20c, die proof in black on chalky-surfaced paper, with the portrait in centre printed in light grey and representing the first state; as well as unissued 24c, die proof in black on card, showing the portrait in centre almost in albino and printed in light grey, representing the first state. Unlisted by Víctor Kneitschel in the "Tomo II" of his 1958 catalogue. (Image)

1889-91, 1/4c to 20p, complete set of 18 values, mint with original gum, the highest denominations displaying a good centring; very fine and scarce; also 1/4c to 20p, the same complete set of 18, nearly all with "MUESTRA" overprint, including an additional 5p with pre-printing crease (few tone spots in three of the low values). (Image)

1889-91, 10p & 50p, prepared but not issued, die proofs including the former in brown-lilac on thin paper affixed to reduced card, the latter in ultramarine-blue printed on card. (Image)

1889-91, "Gregorio Funes" 50p orange-red, "dentado perfecto" (perfect perforation), thick paper with brown original gum, never hinged. Very fine and most rare with intact gum. (Image)

1889-91, "Gregorio Funes" 50p orange-red, "dentado imperfecto" (imperfect perforation), prepared but not issued, thin paper and clear impression, original white gum, very good centring within large margins. Only 100 stamps survived then. Very fine. (Image)

1892-95, "Bernardino Rivadavia", composite die proof comprising no value, 1/2c, 1c & 2c, two items, one in orange-red printed on chalky-surfaced card, the other in green on thin paper affixed to large card, numbered "R.A.-6" at top. Some slight tone spots. A very rare duo. (Image)

1892-95, "Manuel Belgrano", composite die proof comprising no value, 24c, 10c, 16c, scratched 24c & 50c, two items including one printed on chalky-surfaced card, the other on thin paper mounted on large card, both in green with "R.A.-13" heading order number. A very fine and rare duo. (Image)

1892-95, "Manuel Belgrano", composite die proof comprising 30c, 80c & 15c in yellow-buff on chalky-surfaced card. Very rare. (Image)

1892-95, "José de San Martín", composite die proof of 1p & 2p, including three examples in black, brown and green printed on chalky-surfaced card, of which one somewhat reduced. A rare trio. (Image)

1892-95, "Tres Próceres", group of eight die proofs on large cards or on thin paper (2) affixed to large cards, including 3c black, 5c indigo, 12c brown with "R-A-8" at top (rust spotted), 12c orange, 1,20p green and 5p (2) in orange-buff and brown, as well as the unadopted "San Martín" (type B) 5p.

1908-09, 1p indigo and rose, very fresh with original gum. Very fine and scarce. (Image)

1913, Ensemble de 8 cartes postales "Les premiers vols de la poste aérienne de l‘ exposition internationale de Gand / Gent 1913" retrouvées par le propriétaire de la collection vendue en juin 2023 sous le lot 60199, à noter des destinations pour l'étranger Allemagne avec griffe postale EXPRESS, Autriche, Congo Belge et France, également une carte dite pour l'aviateur avec impression au recto du pilote au volant de son appareil sur la plaine de Saint Denis, à Gand, idéal pour étude. (Image)

1914, Grande effigie, sans le nom du dessinateur, 25 centimes bleu COB 125 O cachet linéaire MOEN(GARDE CANAL) en bleu avec date manuscrite 4-2-14, peu courant. (Image)

1916, Bloc de 14 timbres surchargé Belgien 8 cent. sur 7,5Pf. avec un exemplaire à la surcharge incomplète, Belgien seul avec queue du G partiellement imprimée, 5 exemplaires du haut avec *, le reste ** avec gomme marbrée, quelques dents qui commencent à se séparer, signé Berlingin, une variété spectaculaire non répertoriée dans le COB. (Image)

1929-1941, Ensemble de timbres Roi Albert 1er, Type "Montenez" avec tirage de Paris en 2 séries complètes ** puis tirage de Malines avec le 20 francs vert foncé ** haut de feuille et le 50 francs de différentes nuances avec égrainés **/* et une feuille complète de 25 tirage datée de 1941 **, intéressant. (Image)

1985, Chardonneret 9F curiosité: triple impression décalée dont une renversée en panneau entier de 50 exemplaires, spectaculaire et rarissime. (Image)